自营交易公司出金和券商流动性问题

It's a valid concern. The broker relationship and their actual liquidity are often opaque. You'd want to see some concrete evidence or at least consistent positive experiences from other traders with actual payout history, not just challenge completions.

That's a valid concern. I've mostly heard the liquidity issues are more about the broker they use for trading within the challenge/funded account itself, not necessarily payout delays once approved.

That's a super valid concern. I've heard similar whispers, especially with some of the newer prop firms. Have you looked into whether the firm discloses their liquidity providers, or if there are any reviews specifically addressing payout speed and execution for larger accounts?